Highly application of GIS to urban traffic pollution management has been developed, which consisted of proscenium-GIS system, back stage-motor vehicle emission model and spatial data base.
开发了高层应用城市交通污染管理信息系统，由前台gIS系统、后台机动车排放模型、空间数据库三大部分构成。
The effects of the propulsion system on the dry mass of the single stage to orbit vehicle are analyzed, the propulsion system being made up of these engines.
当单级入轨运载器主推进系统由这些发动机组成时，计算和分析了推进系统的组成方式对运载器干质量的影响。
The effects of the propulsion system on the dry mass of the single stage to orbit vehicle are analyzed, the propulsion system being made up of these engines.
当单级入轨运载器主推进系统由这些发动机组成时，计算和分析了推进系统的组成方式对运载器干质量的影响。
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